kernel.git/arch/csky/kernel/stacktrace.c, branch linux-5.7.yHosts the 0x221E linux distro kernel.
https://git.0xinfinity.dev/distro/kernel.git/atom?h=linux-5.7.y2020-05-13T09:55:06Zcsky: Fixup calltrace panic2020-05-13T09:55:06ZGuo Ren2020-05-13T07:15:25Zurn:sha1:18c07d23da5a48525b2955aa269b8bb108c19300
The implementation of show_stack will panic with wrong fp:
addr = *fp++;
because the fp isn't checked properly.
The current implementations of show_stack, wchan and stack_trace
haven't been designed properly, so just deprecate them.
This patch is a reference to riscv's way, all codes are modified from
arm's. The patch is passed with:
- cat /proc/<pid>/stack
- cat /proc/<pid>/wchan
- echo c > /proc/sysrq-trigger
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
csky: stacktrace supported.2018-12-31T15:12:22ZGuo Ren2018-12-09T06:18:05Zurn:sha1:0ea2dc7cd668be5475babecaf6fdeaa464e2847b
The gcc option "-mbacktrace" will push fp(r8),lr into stack and we could
unwind the stack with:
fp = *fp
lr = (unsigned int *)fp[1]
Signed-off-by: Guo Ren <ren_guo@c-sky.com>